walker



(No Model.) 4 Sheets-Sheet 2,

R. L. WALKER. LINING POR FURNAGES.

Patented Apr. 5, 1887.

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4 Sheets-Sheet 3.

(No Model.)

R. L. WALKER. LINING EUR FURNAGES.

Patented Apr. 5, 1887.

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(No Model.) 4 Sheets-Sheet 4.

R. L. WALKER. LINING PoR FURNAGES.

No. 360,494. PatentedApr. 5,y 1887.

d@ hay@ UNITED STATES PATENT OFFICEo ROBERTl L. VALKER, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONEHALF TO YVILLIAM LUMB, OF SAME PLACE.

LINING FOR FURNACES.

SPECIFICATION forming part o1' Letters Patent No. 360,494l dated April 5, 1887.

Application filed June 7, i886. Serial No. 204,433.

To all whom it may concern:

Be it known that I, ROBERT L. WALKER, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Lining for Furnaces, of'which the following is a specification, reference being had to the accompanying drawings, making a part hereof.

My invention is an improvement upon the furnace-linings shown in my Patent No. 75,817,

1o of 1868,' and its main features relate to preventing the practical troubles arising from unequal expansion and contraction of the waterlinings.

In my patented furnace-linings the waterspaces were formed by cores, the linings being castings cored out to form such water-spaces; hence the walls of the water-spaces varied in thickness in spite of the utmost care to set and hold the cores true, and the practical result 2o was, that the linings would crack when in use in the furnace. c

In the drawings, Figure 1 is a perspective explanatory of a furnace with my improved water-linings, and also illustrating the waterconnections. Fig. 2 is a partial front elevation. Figs. 3 and 4 are plan views of the plates used with the said linings. Fig. 5 is apartial side elevation of one ofthe side linings. Fig.

6 is a section online 6 6 of Fig. 5. Fig. Tis a 3o section showing one end of the wrought-iron pipe used for the sidelinings. Fig. Sis a plan of a part of the grate or bottom lining. Fig. 9 is an edge view of Fig. 8. Figs. l() and 1l are sectional views, full size, showing the shape 3 5 of the wrought-iron pipes used in the grate.

In the drawings, A A represent the side linings and B the bottom lining or grate of the furnace, and D the boiler. The pipe d leads from the water-space or bottom of the boiler, 4o and from this pipe cl smaller pipes extend to the lower drums, f, of the side linings and to the sections ofthe grate, as will be clear to all skilled in the art without detailed description.

Each lining is composed of a number of 4.5 wroughtiron pipes, each of which is expanded at its ends, and has each of its ends coated with tin, nickel, copper, or the like, appliedm by the usual tinning process or by a battery; In practice I prefer the tinning process as cheaper;

5o but l found electroplat-ing to answer well. By i pipes, as in the grate-section.

(No model.)

means of this compound pipe I not only do away with the cracking ot' the water-linings, but also am enabled to make the main walls of the water-spaces very much thinner than was possiblein my old style of furnace, and also get more airspace in the grate or bottom lining.

The heads b b of the side-lining pipes are bored and tapped to receive the pipes b2 b3, by

which and the unions b* and pipes b5 b each compound pipe in the side lining is connected to the drunisfand f.

The main feature of my invention consists in that construction of the water-lining for a furnace-namely, a series of pipes connecting two drums, f and f', by means of connecting-pipes 65 and unions. In this construction of waterlining any imperfect pipe can be removed and replaced without disturbing the others, and when the pipes b3 b are at an anglewith the main pipes full provision is afforded for the expansion and contraction of the main pipes. This compound pipe,when used for a bot-tom lining or grate-bar, is best flattened, as shown in Fig. 1l, whereby three important functions are performed-that is,the main pipe is better adapted to support the weight of the fuel, a better airspace is afforded between the pipes, and a free discharge of ashes is provided.

For use as grate-bars I prefer to cast two or more pipes into one head, as illustrated in that form of a section of gratebars shown in Fig. S, for the reason that in casting a section for the grates orbottoni linings it is more convenient to unite a number of pipes at one casting, as illustrated in Fig. 8, than to make each compound pipe independent, as shown in the side lining.

In Fig. S the central group shows three pipes joined at one end by a single casting. The middle pipe of this group has its head east upon it. This section also shows pipes in pairs, with one head east upon a pair at one end, while a head at the other end joins one member of one pair to one member of another pair.

Founders will understand without description the molding and casting of the compound pipe, whether with independent heads, as in side linings, or with heads uniting two or more In Figs. 2, 3, and 4c I show plates g g', of castiron. The plates g extend between the boiler and the side Wall of the furnace, and in practice the top of the boiler and the pipes above the plates are covered by so me non-conducting substance, as will be understood Without description. The plates g' bridge over the space bet-Ween the grate and the side Wall of the ful'- naee. (See Fig. 2.)

The blow-oil coeksf2 from the drums f are used to clean1 the boiler of sediment which collects in the drurnsf.

Vhat I claim as my invention isl. In combination, a sei-ies of pipes, a, heads I) b', couplings b2, b3, b4, b5, and if, and drumsf 15 f', substantially as described.

2. In a steam-boiler furnace, theV two side linings and the bottom lining,` or grate, each composed of a series of wrought pipes Wlth Cast heads, substantially as shown, in comzo bination with the platesg y', all substantially as described.

ROBERT L. VALKER. Witnesses:

EDWARD S. Billon, JOHN R. SNOW. 

